Merge tag 'drm-fixes-2022-05-06' of git://anongit.freedesktop.org/drm/drm

Pull drm fixes from Dave Airlie:
 "A pretty quiet week, one fbdev, msm, kconfig, and two amdgpu fixes,
  about what I'd expect for rc6.

  fbdev:

   - hotunplugging fix

  amdgpu:

   - Fix a xen dom0 regression on APUs

   - Fix a potential array overflow if a receiver were to send an
     erroneous audio channel count

  msm:

   - lockdep fix.

  it6505:

   - kconfig fix"

* tag 'drm-fixes-2022-05-06' of git://anongit.freedesktop.org/drm/drm:
  drm/amd/display: Avoid reading audio pattern past AUDIO_CHANNELS_COUNT
  drm/amdgpu: do not use passthrough mode in Xen dom0
  drm/bridge: ite-it6505: add missing Kconfig option select
  fbdev: Make fb_release() return -ENODEV if fbdev was unregistered
  drm/msm/dp: remove fail safe mode related code

Author: torvalds

drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c

@@ -24,6 +24,7 @@
 #include <linux/module.h>
 
 #include <drm/drm_drv.h>
+#include <xen/xen.h>
 
 #include "amdgpu.h"
 #include "amdgpu_ras.h"
@@ -710,7 +711,8 @@ void amdgpu_detect_virtualization(struct amdgpu_device *adev)
 		adev->virt.caps |= AMDGPU_SRIOV_CAPS_ENABLE_IOV;
 
 	if (!reg) {
-		if (is_virtual_machine())	/* passthrough mode exclus sriov mod */
+		/* passthrough mode exclus sriov mod */
+		if (is_virtual_machine() && !xen_initial_domain())
 			adev->virt.caps |= AMDGPU_PASSTHROUGH_MODE;
 	}
 

drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c

@@ -4440,7 +4440,7 @@ static void dp_test_get_audio_test_data(struct dc_link *link, bool disable_video
 		&dpcd_pattern_type.value,
 		sizeof(dpcd_pattern_type));
 
-	channel_count = dpcd_test_mode.bits.channel_count + 1;
+	channel_count = min(dpcd_test_mode.bits.channel_count + 1, AUDIO_CHANNELS_COUNT);
 
 	// read pattern periods for requested channels when sawTooth pattern is requested
 	if (dpcd_pattern_type.value == AUDIO_TEST_PATTERN_SAWTOOTH ||

drivers/gpu/drm/bridge/Kconfig

@@ -78,6 +78,7 @@ config DRM_ITE_IT6505
         tristate "ITE IT6505 DisplayPort bridge"
         depends on OF
         select DRM_KMS_HELPER
+        select DRM_DP_HELPER
         select EXTCON
         help
           ITE IT6505 DisplayPort bridge chip driver.

drivers/gpu/drm/msm/dp/dp_display.c

@@ -580,12 +580,6 @@ static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
 			dp->dp_display.connector_type, state);
 	mutex_unlock(&dp->event_mutex);
 
-	/*
-	 * add fail safe mode outside event_mutex scope
-	 * to avoid potiential circular lock with drm thread
-	 */
-	dp_panel_add_fail_safe_mode(dp->dp_display.connector);
-
 	/* uevent will complete connection part */
 	return 0;
 };

drivers/gpu/drm/msm/dp/dp_panel.c

@@ -151,15 +151,6 @@ static int dp_panel_update_modes(struct drm_connector *connector,
 	return rc;
 }
 
-void dp_panel_add_fail_safe_mode(struct drm_connector *connector)
-{
-	/* fail safe edid */
-	mutex_lock(&connector->dev->mode_config.mutex);
-	if (drm_add_modes_noedid(connector, 640, 480))
-		drm_set_preferred_mode(connector, 640, 480);
-	mutex_unlock(&connector->dev->mode_config.mutex);
-}
-
 int dp_panel_read_sink_caps(struct dp_panel *dp_panel,
 	struct drm_connector *connector)
 {
@@ -215,8 +206,6 @@ int dp_panel_read_sink_caps(struct dp_panel *dp_panel,
 			rc = -ETIMEDOUT;
 			goto end;
 		}
-
-		dp_panel_add_fail_safe_mode(connector);
 	}
 
 	if (panel->aux_cfg_update_done) {

drivers/gpu/drm/msm/dp/dp_panel.h

@@ -59,7 +59,6 @@ int dp_panel_init_panel_info(struct dp_panel *dp_panel);
 int dp_panel_deinit(struct dp_panel *dp_panel);
 int dp_panel_timing_cfg(struct dp_panel *dp_panel);
 void dp_panel_dump_regs(struct dp_panel *dp_panel);
-void dp_panel_add_fail_safe_mode(struct drm_connector *connector);
 int dp_panel_read_sink_caps(struct dp_panel *dp_panel,
 		struct drm_connector *connector);
 u32 dp_panel_get_mode_bpp(struct dp_panel *dp_panel, u32 mode_max_bpp,

drivers/video/fbdev/core/fbmem.c

@@ -1434,7 +1434,10 @@ fb_release(struct inode *inode, struct file *file)
 __acquires(&info->lock)
 __releases(&info->lock)
 {
-	struct fb_info * const info = file->private_data;
+	struct fb_info * const info = file_fb_info(file);
+
+	if (!info)
+		return -ENODEV;
 
 	lock_fb_info(info);
 	if (info->fbops->fb_release)